Cleaner (Kang Goo)

"Me? A garbage collector like you."

Jin Seong-Won, a member of a garbage collector organization that cleans up the garbage of society. His only hope is to quickly achieve his goal, get paroled, and live with his younger sister, under the watchful eye of Director Kang, who manages the garbage collector organization, equating the organization's justice with his own justice and punishing the villains, but one day, everything starts to go wrong...

(Source: Kakaopage, translated)